摘要
本文通过对电气铁道了Y/Δ-11和V/V牵引变压器三相不对称运行和T接(scott)牵引变压器两相负荷不平衡运行的谐波分析,提出了电气铁道输入电力系统不平衡谐波的序谐波和线谐波电流概念并对上述3种牵引变压器进行了计算。(输入系统的负序(基波)电流用谐波电流统一公式计算)。讨论了各次线谐波和序谐波电流以及负序(基波)电流随供电臂机车电流的变化规律。 文中对上述3种牵引变压器输入系统各次谐波电流的特点和负序(基波)电流的大小作了比较。并将国内外其它几种牵引变压器等效为上述Y/Δ-11或T接牵引变压器,以便利用所述公式计算它们输入电力系统的不平衡谐波。
This paper presents the concept of sequence - harmonic and Line-harmonic currents of unbalanced harmonics injected into power systems by the electric railway supply systems through the harmonic analysis of the Y/△-11 and v/v traction transformers ih asymmetrical three-phase operation and T-connected (Scott) traction transformer in unbalanced two-phase operation. The paper provides the computation for those traction transformers and discusses the variation of line- and sequence-harmonics of each order and negative sequence currents (fundamental) depending upon the variation of supply arm currents for electric trains. The other three types of specific traction transformers of electric railways are converted into equivalent Y/△6-11 or T-Conected transformer and then analysed in a similar way.
出处
《电网技术》
EI
CSCD
北大核心
1989年第1期15-25,共11页
Power System Technology
